DIAMEX AVR ISP: ISP programmer for Atmel AVR, USB port at reichelt elektronik
Source USB ISP Programmer for AVR ATMega ATTiny 51 AVR Board ISP on m.alibaba.com
Amazon.com: HiLetgo 51 AVR ATMEGA8 Programmer USBasp USB ISP 10 Pin USB Programmer 3.3V/5V with Cable : Electronics
Pololu USB AVR Programmer
AVR ISP Programmer (In-Sytem programmer) for ATMEL
USBASP USB ISP Programmer For AVR ATMEL Arduino ATMega Including IDC Cable | eBay
Amazon.com: KeeYees 2pcs Downloader Programmer for USBASP for ISP with Cable and 10Pin to 6Pin Adapter Board for 51 for AVR Series Microcontroller : Electronics
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Amazon.com: Geekstory for ATMEL 51 AVR USB ISP ASP Microcontroller Programmer Downloader with Cable + 10Pin to 6Pin Adapter Board for Ender 3 or Ender 3 Pro : Electronics